The cross section for the production of single top quarks in the t channel is measured in proton–proton collisions at 13 TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of 2.2 fb−1. The event selection requires one muon and two jets where one of the jets is identified as originating from a bottom quark. Several kinematic variables are then combined into a multivariate discriminator to distinguish signal from background events. A fit to the distribution of the discriminating variable yields a total cross section of 238 ±13 (stat) ±29 (syst) pb and a ratio of top quark and top antiquark production of Rt-ch.=1.81 ±0.18 (stat) ±0.15 (syst). From the total cross section the absolute value of the CKM matrix element Vtb is calculated to be 1.05 ±0.07 (exp) ±0.02 (theo). All results are in agreement with the standard model predictions.
Cross section measurement of t-channel single top quark production in pp collisions at sqrt(s)=13TeV
Amapane, N.;Argiro, S.;Bellan, R.;Costa, M.;Covarelli, R.;Kiani, B.;Migliore, E.;Monaco, V.;Monteil, E.;Obertino, M. M.;Pacher, L.;Pinna Angioni, G. L.;Ravera, F.;Romero, A.;Sacchi, R.;Sola, V.;Solano, A.;
2017-01-01
Abstract
The cross section for the production of single top quarks in the t channel is measured in proton–proton collisions at 13 TeV with the CMS detector at the LHC. The analyzed data correspond to an integrated luminosity of 2.2 fb−1. The event selection requires one muon and two jets where one of the jets is identified as originating from a bottom quark. Several kinematic variables are then combined into a multivariate discriminator to distinguish signal from background events. A fit to the distribution of the discriminating variable yields a total cross section of 238 ±13 (stat) ±29 (syst) pb and a ratio of top quark and top antiquark production of Rt-ch.=1.81 ±0.18 (stat) ±0.15 (syst). From the total cross section the absolute value of the CKM matrix element Vtb is calculated to be 1.05 ±0.07 (exp) ±0.02 (theo). All results are in agreement with the standard model predictions.File | Dimensione | Formato | |
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